TX·7430
SER
IAL
NO. 32 58
ONKYO
,
~
,
SERVICE MANUAL
aUARTZ
SYNTHESIZED
TUNER AMPLIFIER
MODEL TX-7430
-
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFI ED BY MARK
L.
ON THE
SCHEMATIC DIAGR
AM
AND IN THE PARTS LIST ARE
CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
REPLACE THESE COMPONENTS WITH ONKYO PARTS
WHOSE PARTS NUMBERS APPEAR AS SHOWN IN THIS
MANUAL.
MAKE LEAKAGE-CURR ENT OR RESISTANCE MEA-
SUREMENTS TO DETERMINE THAT EXPOSED PARTS
ARE ACCEPTABLY INSULATED FROM TH E SUPPLY
CIRCUIT BEFORE RETURNING THE APPLIANCE TO
TH E CUSTOMER.
TABLE OF CONTENTS
Specification s 2
Service procedures 3
Exploded view _. . . . . . . . . . . . . . 4
Parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Circuit description s 6
Block diagram - Amp. section
- . . . . . . . . . . . . . . . 12
- Tuner section -
.,
. . . . . . . . . .
..
13
Block diagram
of
IC 14
Packing view
..
. . . . . . . . . . . . . . . . . . . . . . . .
..
17
Adjustment procedures __.
..
18
Pc bca rd view/parts list
Power amp . . . . . . . . . . . . . . . . . . . . . . . . . .
..
21
FM
/AM tun er 25
Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Preamp. . _. . . . . . . . . 30
Remot e cuntrol . . . . . . . . . . . . . . . . . . . . . . . . 31
Switch
3 1
Spea ke r 32
Volume 32
Schematic diagram
Amp. section " 23
Tuner section 27
Disassembli ng prccedu res 33
ON
KYO
®
AUDIO
COMPONfNTS
- 1-
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